added some code

wrote some code to test some functionallity

src/client_backend/queue _ctrl.cpp

@@ -0,0 +1,45 @@
+#ifndef QUEUE_CTRL_CPP
+#define QUEUE_CTRL_CPP
+#include "queue_ctrl.h"
+#include <string.h>
+#define queue_limit 1000
+#define command_limit 100
+char queue[1000][100];
+int queue_size = 0;
+int queue_start = 0;
+int queue_end = 0;
+int queue_push(char* str) {
+	if (queue_size == queue_limit) {
+		return 1;
+	}
+	else if (strlen(str) >= command_limit) {
+		return 2;
+	}
+	else {
+		strcpy_s(queue[queue_end], str);
+		queue_end++;
+		queue_size++;
+		if (queue_end == queue_limit) {
+			queue_end = 0;
+		}
+		return 0;
+	}
+}
+int queue_pop(char* str) {
+	if (queue_size == 0) {
+		return 1;
+	}
+	else {
+		strcpy_s(str, 100, queue[queue_start]);
+		queue_start++;
+		queue_size--;
+		if (queue_start == queue_limit) {
+			queue_start = 0;
+		}
+		return 0;
+	}
+}
+int get_queue_size() {
+	return queue_size;
+}
+#endif // !QUEUE_CTRL_CPP